schrmh/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Clipboard Example</title>
  </head>
  <body>
    Image stuff (CC0 licensed image):<br>
    <img id="my-image" /><br>
    <button id="copy-img-btn_clipboard">Copy JPEG (CLIPBOARD)</button>
    <button id="copy-img-btn_selection">Copy JPEG (PRIMARY selection)</button>
    <br><br>Text stuff:
    <input id="my-input" type="text"><br>
    <button id="copy-btn">Copy text from text field to CLIPBOARD</button>
    <button id="paste-btn">Paste text from CLIPBOARD into text field</button>
    <script src="./renderer.js"></script>
    <br>Info:<br>
    1) Click a button to copy either text from the text field or the JPEG to a X11 selection <br>
    (standard X11 selections: CLIPBOARD; PRIMARY — called "selection" in electron).<br>
    2) Run this (that you optimally) already have ready to send a terminal<br>
    (<b>if you copy — for PRIMARY mark — anything else before running this, selection content WILL change</b>):<br>
    a) To check the (Ctrl+V) CLIPBOARD selection:<br>
    <b><code>xclip -o -target TARGETS -selection clipboard</code></b><br>
    2b) To check the (middle click mouse to paste marked text) PRIMARY selection:<br>
  <b><code>xclip -o -target TARGETS -selection primary</code></b><br>
  <br>
    You will then see the targets other applications can ask the application for.<br>
    E.g. since xclip lists no image/jpeg target for this application despite the image being JPEG...<br>
    Other apps will likely receive a PNG which might mean more data than it would be necessary...
  <br>
  </body>
</html>

## main.js
const { app, BrowserWindow } = require('electron')

function createWindow () {
  const win = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      nodeIntegration: true,
      contextIsolation: false,
      preload: __dirname + '/preload.js'
    }
  })

  win.loadFile('index.html')
}

app.whenReady().then(() => {
  createWindow()

  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) {
      createWindow()
    }
  })
})

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

## package.json
{
  "name": "zonked-lady-surprise-chxjd",
  "productName": "zonked-lady-surprise-chxjd",
  "description": "My Electron application description",
  "keywords": [],
  "main": "./main.js",
  "version": "1.0.0",
  "author": "duda",
  "scripts": {
    "start": "electron ."
  },
  "dependencies": {},
  "devDependencies": {
    "electron": "24.0.0-beta.4"
  }
}

## preload.js
const { nativeImage, clipboard } = require('electron');

window.nativeImage = nativeImage;
window.clipboard = clipboard;

## renderer.js
const copyBtn = document.getElementById('copy-btn');
const pasteBtn = document.getElementById('paste-btn');
const input = document.getElementById('my-input');

copyBtn.addEventListener('click', () => {
  clipboard.writeText(input.value);
});

pasteBtn.addEventListener('click', () => {
  const text = clipboard.readText();
  input.value = text;
});

const img = document.getElementById('my-image');
const copyImgBtn_clipboard_selection = document.getElementById('copy-img-btn_clipboard');
const copyImgBtn_primary_selection = document.getElementById('copy-img-btn_selection');

fetch('https://upload.wikimedia.org/wikipedia/commons/5/57/Centaure.jpeg')
  .then(response => response.arrayBuffer())
  .then(buffer => {
    const image = nativeImage.createFromBuffer(Buffer.from(buffer));
    img.src = image.toDataURL();
  });

//Normal paste (Ctrl+V). Check with xclip -o -target TARGETS -selection clipboard:
copyImgBtn_clipboard_selection.addEventListener('click', () => {
  const image = nativeImage.createFromDataURL(img.src);
  clipboard.writeImage(image, "clipboard");
});

//Middle click button paste. Check with xclip -o -target TARGETS -selection primary
copyImgBtn_primary_selection.addEventListener('click', () => {
  const image = nativeImage.createFromDataURL(img.src);
  clipboard.writeImage(image, "selection");
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>Clipboard Example</title>
	</head>
	<body>
	Image stuff (CC0 licensed image):<br>
	<img id="my-image" /><br>
	<button id="copy-img-btn_clipboard">Copy JPEG (CLIPBOARD)</button>
	<button id="copy-img-btn_selection">Copy JPEG (PRIMARY selection)</button>
	<br><br>Text stuff:
	<input id="my-input" type="text"><br>
	<button id="copy-btn">Copy text from text field to CLIPBOARD</button>
	<button id="paste-btn">Paste text from CLIPBOARD into text field</button>
	<script src="./renderer.js"></script>
	<br>Info:<br>
	1) Click a button to copy either text from the text field or the JPEG to a X11 selection <br>
	(standard X11 selections: CLIPBOARD; PRIMARY — called "selection" in electron).<br>
	2) Run this (that you optimally) already have ready to send a terminal<br>
	(<b>if you copy — for PRIMARY mark — anything else before running this, selection content WILL change</b>):<br>
	a) To check the (Ctrl+V) CLIPBOARD selection:<br>
	<b><code>xclip -o -target TARGETS -selection clipboard</code></b><br>
	2b) To check the (middle click mouse to paste marked text) PRIMARY selection:<br>
	<b><code>xclip -o -target TARGETS -selection primary</code></b><br>
	<br>
	You will then see the targets other applications can ask the application for.<br>
	E.g. since xclip lists no image/jpeg target for this application despite the image being JPEG...<br>
	Other apps will likely receive a PNG which might mean more data than it would be necessary...
	<br>
	</body>
	</html>
	const { app, BrowserWindow } = require('electron')

	function createWindow () {
	const win = new BrowserWindow({
	width: 800,
	height: 600,
	webPreferences: {
	nodeIntegration: true,
	contextIsolation: false,
	preload: __dirname + '/preload.js'
	}
	})

	win.loadFile('index.html')
	}

	app.whenReady().then(() => {
	createWindow()

	app.on('activate', () => {
	if (BrowserWindow.getAllWindows().length === 0) {
	createWindow()
	}
	})
	})

	app.on('window-all-closed', () => {
	if (process.platform !== 'darwin') {
	app.quit()
	}
	})
	{
	"name": "zonked-lady-surprise-chxjd",
	"productName": "zonked-lady-surprise-chxjd",
	"description": "My Electron application description",
	"keywords": [],
	"main": "./main.js",
	"version": "1.0.0",
	"author": "duda",
	"scripts": {
	"start": "electron ."
	},
	"dependencies": {},
	"devDependencies": {
	"electron": "24.0.0-beta.4"
	}
	}
	const { nativeImage, clipboard } = require('electron');

	window.nativeImage = nativeImage;
	window.clipboard = clipboard;
	const copyBtn = document.getElementById('copy-btn');
	const pasteBtn = document.getElementById('paste-btn');
	const input = document.getElementById('my-input');

	copyBtn.addEventListener('click', () => {
	clipboard.writeText(input.value);
	});

	pasteBtn.addEventListener('click', () => {
	const text = clipboard.readText();
	input.value = text;
	});

	const img = document.getElementById('my-image');
	const copyImgBtn_clipboard_selection = document.getElementById('copy-img-btn_clipboard');
	const copyImgBtn_primary_selection = document.getElementById('copy-img-btn_selection');

	fetch('https://upload.wikimedia.org/wikipedia/commons/5/57/Centaure.jpeg')
	.then(response => response.arrayBuffer())
	.then(buffer => {
	const image = nativeImage.createFromBuffer(Buffer.from(buffer));
	img.src = image.toDataURL();
	});

	//Normal paste (Ctrl+V). Check with xclip -o -target TARGETS -selection clipboard:
	copyImgBtn_clipboard_selection.addEventListener('click', () => {
	const image = nativeImage.createFromDataURL(img.src);
	clipboard.writeImage(image, "clipboard");
	});

	//Middle click button paste. Check with xclip -o -target TARGETS -selection primary
	copyImgBtn_primary_selection.addEventListener('click', () => {
	const image = nativeImage.createFromDataURL(img.src);
	clipboard.writeImage(image, "selection");
	});